Malicious PDF — malware analysis report

Static analysis result for SHA-256 de37ad0b29b10062…

MALICIOUS

PDF

37.6 KB Created: 2020-08-12 16:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0ea3fde22648fea0dffd9e79b5aa167 SHA-1: 638159415d9537265d46755497c451b55abd96d5 SHA-256: de37ad0b29b10062d5349d38d646bdf02ab0e2a8412ffad7c77e22ffd925f900
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This indicates a link farm or redirector tactic designed to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the text 'Making plural nouns worksheet pdf' and the malicious URL, suggesting a lure to trick users into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=making+plural+nouns+worksheet+pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • http://files.gnshope.org/uploads/1/3/1/1/131164063/farimixofik.pdf
    • http://files.alphaplt.com/uploads/1/3/0/9/130969241/tadilige-duxigegapixato-mujilufil.pdf
    • http://files.stringsforhope.com/uploads/1/3/1/6/131606546/wimisi_vogudabuv_tewelewuf_sanukodanoxe.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/35902184091.pdf
    • https://cdn.shopify.com/s/files/1/0433/3653/2136/files/losonu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/matov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0050/files/magutakepu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/aptitude_and_reasoning_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/8290778449.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4022/files/low_cholesterol_diet_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/85158797252.pdf
    • https://cdn.shopify.com/s/files/1/0431/3468/1250/files/how_to_become_more_intelligent.pdf
    • https://cdn.shopify.com/s/files/1/0439/3032/1051/files/35269406073.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2591/files/cara_membuat_bookmark_di_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0432/2633/3351/files/41474060402.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000550e.bin
6b200f98183d6e5ce15c159f03208e078431c9c3e99f57c6e5f75a3b10f8cfd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550E 5464 bytes
font_01_sfnt_off000067b1.bin
2e7985604ac2cbca6c121ab4f903472c3bfd9ea6ad4b3d52e06edd2d8f3a8758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B1 9960 bytes

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